diff --git a/.mps/modules.xml b/.mps/modules.xml
index c7335d44..e67f3015 100644
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\ No newline at end of file
diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/generator/templates/main@generator.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/generator/templates/main@generator.mps
new file mode 100644
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/jetbrains.mps.baseLanguage.collectionsExt.mpl b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/jetbrains.mps.baseLanguage.collectionsExt.mpl
new file mode 100644
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+ 0fda14cc-a416-4c81-869a-2175d8b3325d(jetbrains.mps.baseLanguageExt)
+ 88dcbb14-19c3-4776-8f81-33611ca4d87c(jetbrains.mps.baseLanguage.sequence)
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.behavior.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.behavior.mps
new file mode 100644
index 00000000..0f9eb7e9
--- /dev/null
+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.behavior.mps
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.constraints.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.constraints.mps
new file mode 100644
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--- /dev/null
+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.constraints.mps
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.editor.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.editor.mps
new file mode 100644
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+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.editor.mps
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.structure.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.structure.mps
new file mode 100644
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+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.structure.mps
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.types.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.types.mps
new file mode 100644
index 00000000..dd92eeae
--- /dev/null
+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.types.mps
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diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.typesystem.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.typesystem.mps
new file mode 100644
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--- /dev/null
+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguage.collectionsExt/models/jetbrains.mps.baseLanguage.collectionsExt.typesystem.mps
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diff --git a/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/jetbrains.mps.baseLanguage.collectionsExt.test.msd b/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/jetbrains.mps.baseLanguage.collectionsExt.test.msd
new file mode 100644
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+ 6ed54515-acc8-4d1e-a16c-9fd6cfe951ea(MPS.Core)
+ f3061a53-9226-4cc5-a443-f952ceaf5816(jetbrains.mps.baseLanguage)
+ 6998f568-f0e9-473b-b4a8-9efb6499fc8d(jetbrains.mps.coderules.typechecking)
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diff --git a/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/models/jetbrains.mps.baseLanguage.collectionsExt.test.sequence.mps b/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/models/jetbrains.mps.baseLanguage.collectionsExt.test.sequence.mps
new file mode 100644
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--- /dev/null
+++ b/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/models/jetbrains.mps.baseLanguage.collectionsExt.test.sequence.mps
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diff --git a/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/models/jetbrains.mps.baseLanguage.collectionsExt.test.sequence@tests.mps b/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/models/jetbrains.mps.baseLanguage.collectionsExt.test.sequence@tests.mps
new file mode 100644
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--- /dev/null
+++ b/samples/mpscore/solutions/jetbrains.mps.baseLanguage.collectionsExt.test/models/jetbrains.mps.baseLanguage.collectionsExt.test.sequence@tests.mps
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